Congress, the court ruled, “may draft another formula based on current conditions.”

“Our country has changed, and while any racial discrimination in voting is too much, Congress must ensure that the legislation it passes to remedy that problem speaks to current conditions,” the majority said.

“There is no doubt that these improvements are in large part because of the Voting Rights Act. The Act has proved immensely successful at redressing racial discrimination and integrating the voting process," Roberts wrote.

The court did not rule on Section 5 of the Voting Rights Act, the preclearance requirement itself, which requires those affected states to have changes to their voting laws cleared by the Justice Department or a federal court in Washington, D.C., before they go into effect.

"The sad irony of today’s decision lies in its utter failure to grasp why the VRA has proven effective," Ginsburg wrote. "The Court appears to believe that the VRA’s success in eliminating the specific devices extant in 1965 means that preclear­ance is no longer needed."